Experimental And Numerical Evaluation Of Reinforced Concrete Walls Retrofit Systems For Blast Mitigation
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Experimental And Numerical Evaluation Of Reinforced Concrete Walls Retrofit Systems For Blast Mitigation
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Author : Alaa E. El-Sisi
language : en
Publisher:
Release Date : 2019
Experimental And Numerical Evaluation Of Reinforced Concrete Walls Retrofit Systems For Blast Mitigation written by Alaa E. El-Sisi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with Concrete categories.
Blast Retrofit Of Reinforced Concrete Walls And Slabs
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Author : Eric Jacques
language : en
Publisher:
Release Date : 2011
Blast Retrofit Of Reinforced Concrete Walls And Slabs written by Eric Jacques and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
Blast Simulator Wall Tests
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Author : Michael G. Oesterle
language : en
Publisher:
Release Date : 2009
Blast Simulator Wall Tests written by Michael G. Oesterle and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.
Loads generated in explosions that result from terrorist attacks and industrial accidents create devastating hazards for buildings and their occupants. The objective of this dissertation is to develop design guidelines and methodologies for protective/hardening strategies used to mitigate blast hazards in reinforced concrete and concrete masonry walls. Commonly, guidelines and methodologies are developed from experimental data. Field testing with live explosive is a reliable experimental method for demonstrating the performance of blast resistant concepts, but it is expensive, time consuming, and often produces low quality data. Static testing is another experimental method that allows researchers to clearly observe behavior and failure modes of structural components; however this too is limited because it cannot account for the rate effects associated with blast loads. The UCSD Blast Simulator was developed to offers an alternative method for testing structures to loads generated in an explosion without the difficulties and limitations associated with field and static testing. For this dissertation, tests were conducted with the blast simulator to study reinforced concrete walls protected with frangible panels, concrete masonry walls strengthened with carbon fiber reinforced polymer composite, and unreinforced masonry walls retrofitted with polyurea catcher systems. The objective of the dissertation was achieved through a succession of tasks that included; the development of a test protocol, validation and implementation of numerical models to predict loads delivered to specimens during blast simulator tests, development of method to correlate blast simulator loads to air blast loads, generation of high quality data on specimens with mitigation strategies for validation of numerical models to predict response of hardened/protected reinforced concrete and concrete masonry walls, and investigation of design variables with parametric studies. The investigation of concrete masonry walls demonstrated that the addition of carbon fiber reinforced polymers can increase the resistance to blast loads, but may result in a brittle failure mode. The study of reinforced concrete walls showed that frangible panels can improve the response by adding mass to the system. Finally, the research performed on unreinforced masonry walls with polyurea catcher emphasized the need for proper connection detailing.
Concrete Masonry Wall Retrofit Systems For Blast Protection
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Author : Carol Faye Johnson
language : en
Publisher:
Release Date : 2014
Concrete Masonry Wall Retrofit Systems For Blast Protection written by Carol Faye Johnson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
The increased threat against government and public facilities in the United States and abroad has highlighted the need to provide an economic and efficient method to retrofit existing conventional structures. Hollow, unreinforced, concrete masonry unit (CMU) infill walls, commonly used in reinforced concrete or steel framed structures, are particularly vulnerable to blast loads. Facilities that incorporate CMU walls must either be hardened or retrofitted for explosive events. Conventional retrofit techniques that focus on increasing the overall strength of the structure by adding steel or concrete are difficult to implement, time consuming, expensive, and in some cases, increase the debris hazard. The current research presents an alternative retrofit system for CMU walls that involves the application of an elastomeric material applied to the interior surface of the wall to prevent secondary debris in the form of CMU fragments from entering the structure when it is exposed to blast loads. The experimental program used to evaluate the alternative retrofit systems was divided into three phases. In Phase one, resistance functions for seven different retrofit systems were developed in 24 subscale static experiments. In Phase two, the structural response of the retrofit systems subjected to blast loads was evaluated in 25 subscale experiments. The final phase of the experimental program consisted of 18 full-scale high-explosive (HE) experiments used to validate the structural response observed in the subscale dynamic experiments. Data generated from the experimental program were used to develop a single-degree-of-freedom (SDOF) model to predict the mid-span deflection of the retrofitted CMU walls subjected to blast loads. The subscale resistance functions from Phase one were scaled and used in the SDOF model. The full-scale experimental results and the predicted results from the model were compared and the retrofit systems were ranked according to the qualitative and quantitative results obtained from the experimental and analytical research. The electronic version of this dissertation is accessible from http://hdl.handle.net/1969.1/151905
Explosive Breaching Of Reinforced Concrete Walls
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Author : Stephen A. Akers
language : en
Publisher:
Release Date : 2011
Explosive Breaching Of Reinforced Concrete Walls written by Stephen A. Akers and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with Blast effect categories.
Sheet Retrofit Systems For Concrete Slabs For Blast Mitigation
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Author : Benjamin James Tappmeyer
language : en
Publisher:
Release Date : 2015
Sheet Retrofit Systems For Concrete Slabs For Blast Mitigation written by Benjamin James Tappmeyer and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
Various ductile sheet materials are currently used to retrofit existing concrete wall systems to mitigate the effects of external blast. Sheet retrofits can increase the strength and ductility of the wall, and also provide a means of fragmentation control. To develop blast design guidelines for sheet blast-retrofits, it is first necessary to develop static resistance functions which are experimentally verified. Static resistance functions were developed for various types of sheet retrofits and a reinforced concrete slab using a mechanics of materials approach. The individual models for the sheet and reinforced concrete slab were then combined to develop a static resistance function for the concrete-sheet retrofit systems. A series of full scale quasi-static tests were conducted using a hydraulic loading tree to experimentally verify the analytical models. The following types of thin sheeting were examined: steel, rubber, polyurea, polypropylene composite, and a polymer-fiber composite sheet.
Experimental And Numerical Study Of Steel Fiber Reinforced Concrete Structures Subjected To Internal Explosion
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Author : Nikhil Vasant Moon
language : en
Publisher:
Release Date : 2020
Experimental And Numerical Study Of Steel Fiber Reinforced Concrete Structures Subjected To Internal Explosion written by Nikhil Vasant Moon and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with categories.
This research investigates the effect of an accidental explosion of a steam boiler in a boiler room on steel fiber reinforced concrete (SFRC) structure in an industrial facility, using nonlinear analysis in ABAQUS FEA software. The mechanical properties of SFRC are calculated through testing at the UTA Civil Engineering Laboratory Building. Steel fiber dosages in concrete at different volume fractions are examined for the mechanical properties of concrete. In total, 9 (4" x 8") cylindrical specimens for compressive strength and modulus of elasticity test, 9 (4" x 8") cylindrical specimens for tensile strength test, and 9 (6" x 6" x 21") beam specimens for modulus of rupture test were produced and tested after 28 days of curing. Modulus of Elasticity is found for the different volume fractions of SRFC by stress vs strain curve from experimental tests. Adding 1% of steel fiber in concrete can increase the modulus of elasticity by 11%, compressive strength by 22%, tensile strength by 42%, and modulus of rupture by 32 %. Using the concrete properties obtained from experimental results, numerical analysis is done to find the effect of the Steam Boiler explosion on SFRC boiler room using nonlinear analysis in ABAQUS FEA software. Dynamic/Explicit loading condition is considered for analysis. It's found that adding 1% steel fiber by volume fraction can increase the overall capacity of concrete structure by 26%, decrease strain by 21%, and decrease the deflection by 23%. Parametric studies are also carried out at 1% SFRC by different arrangements of Steam Boiler closed room - with a rigid roof, with a frangible roof and circular vent in the roof. It's found that the reflected pressure due to explosion can be significantly reduced on the surrounding walls. In case, roof with circular vent the stresses decrease by 50%, strain decrease by 70% and with frangible roof stress decrease by 31%, strain by 38% and strain decrease by 38%.
Numerical Assessment Of Reinforced Concrete Members Retrofitted With Fiber Reinforced Polymer For Resisting Blast Loading
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Author : Graham A. Long
language : en
Publisher:
Release Date : 2012
Numerical Assessment Of Reinforced Concrete Members Retrofitted With Fiber Reinforced Polymer For Resisting Blast Loading written by Graham A. Long and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
The use of fiber reinforced polymers for the retrofit of existing structures is a common practice in blast protection. The tools used to assess the behavior of structures have become more refined allowing for precise modeling of reinforced members retrofitted with fiber reinforced polymers (FRP). However, many of these tools require extensive computational power that is often time consuming. This study aims to adapt an existing expedient dynamic analysis assessment tool in order to account for the behavior of reinforced concrete members retrofitted with FRP for flexural enhancement. FRP retrofits have been shown to increase the capacity of the members under severe loading conditions. However, the strength associated with the FRP layer is not always able to fully develop due to the debonding behavior between the two surfaces. The model will seek to capture this behavior by employing fracture mechanics along the bonded interface. The results of the modeling tool will be validated by comparing them to those of finite element analysis programs as well as available experimental test data. An additional parametric study will be conducted to evaluate the models ability to capture the bond behavior when adjusting the properties associated with the FRP.
Analytical And Experimental Evaluation Of Steel Sheets For Blast Retrofit Design
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Author : John Anthony Kennedy
language : en
Publisher:
Release Date : 2005
Analytical And Experimental Evaluation Of Steel Sheets For Blast Retrofit Design written by John Anthony Kennedy and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with Blast effect categories.
Blast resistant design has come to the forefront of engineering concerns in the wake of recent terrorist threats to the United States. The focus of this research is to evaluate the use of thin steel sheets as a suitable retrofit material that will assist a wall system in mitigating the applied loads during a blast event. The static resistance of the wall system can be analytically predicted and experimentally verified. Additionally, an efficient means of connecting the steel sheets to the wall system can be experimentally determined. The analytical model will ultimately be implemented into a single degree of freedom dynamic model, which will provide the basis for a user-friendly blast design code. The research shows that a steel sheet retrofit system can effectively increase the strength and ductility of a wall, which allows the wall system to adequately resist the energy imparted from certain blast threats.
Advances In Frp Composites In Civil Engineering
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Author : Lieping Ye
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-02-01
Advances In Frp Composites In Civil Engineering written by Lieping Ye and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-02-01 with Technology & Engineering categories.
"Advances in FRP Composites in Civil Engineering" contains the papers presented at the 5th International Conference on Fiber Reinforced Polymer (FRP) Composites in Civil Engineering in 2010, which is an official conference of the International Institute for FRP in Construction (IIFC). The book includes 7 keynote papers which are presented by top professors and engineers in the world and 203 papers covering a wide spectrum of topics. These important papers not only demonstrate the recent advances in the application of FRP composites in civil engineering, but also point to future research endeavors in this exciting area. Researchers and professionals in the field of civil engineering will find this book is exceedingly valuable. Prof. Lieping Ye and Dr. Peng Feng both work at the Department of Civil Engineering, Tsinghua University, China. Qingrui Yue is a Professor at China Metallurgical Group Corporation.